Otaq Sara () is a village in Gatab-e Jonubi Rural District of Gatab District in Babol County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 1,468 in 349 households. The following census in 2011 counted 1,390 people in 388 households. The 2016 census measured the population of the village as 1,521 people in 496 households.